program of remote control

void setup()
{
  pinMode(15,INPUT);
  Serial.begin(9600);
}

void loop()
{
  int v=0;

  int a=pulseIn(15,LOW);
  if(a>2000)
  {
    for(int i=0;i<12;i++)  
    {
      if(pulseIn(15,LOW)>1000)//doubt is here
      {
        v=v+(1<<i);

        
      }
    }
    Serial.println(v);
    delay(500);
  }
}

// Read Sony SIRC 12 Infrared Remote Protocol
// Arduino code for 3 pin 40kHZ IR receiver chip

// initialise
void setup()
{
  pinMode(15,INPUT);       // set pin ?? as input
  Serial.begin(9600);      // 9600 baud 8,n,1
}

// keep looping to get button press information forever
void loop()
{
  int v=0;                 // initialise v (12 bit address/command store)

  int a=pulseIn(15,LOW);            // expecting start bit of 2400uS low
  if(a>2000)                        // only process message if start bit is longer than 2000uS
  {
    for(int i=0;i<12;i++)           // SIRC 12 protocol is 12 data bits (after start bit)
    {
      if(pulseIn(15,LOW)>1000)      // doubt is here - 600uS low for zero bit - so do nothing
      {                             // 1200us low for 'on'e bit, so change a single bit to a 1
        v=v+(1<<i);                 // change bit 'i' to a one if 1200uS low

        
      }
    }
    Serial.println(v);              // send the result to serial port
    delay(500);                     // stop listening for a while (maybe to ignore the repeat messages that SOny usually send)
  }
}